Description: This module is designed with protocol specially, compatible with hub (also Supported) to realize the whole linkage of your house,a really good substitution for unstable Wi-Fi. Support 110V-240V voltage, can be used as 1 or 2 circuits (2 switches control 1 light); just connect it to 1 of the 2 switches, and then convert the connected device into a smart device (use Allows for hands-free voice and remote control;support Amazon Alexa Home voice control and Smart Life and Tuya App control on smart phones with special Tuya ZigBee 3.0 hub required and connected. Can be installed in old wall box, which is an essential accessory for your home automation system. DIY your smart home: it can let you DIY a lot of smart projects like smart lights, fans, garage door, humidifier, thermostat etc. Specification: Material: PC Size Chart: 59x42x20mm/2.32x1.65x0.79inch Package Includes: 1 Piece Mini Smart Relay Wifi Switch Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!